21531430522142 has 16 divisors (see below), whose sum is σ = 32316569529552. Its totient is φ = 10759241267520.

The previous prime is 21531430522109. The next prime is 21531430522171. The reversal of 21531430522142 is 24122503413512.

It is a super-3 number, since 3×21531430522142³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79465448 + ... + 79735940.

It is an arithmetic number, because the mean of its divisors is an integer number (2019785595597).

Almost surely, 2^{21531430522142} is an apocalyptic number.

21531430522142 is a deficient number, since it is larger than the sum of its proper divisors (10785139007410).

21531430522142 is a wasteful number, since it uses less digits than its factorization.

21531430522142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294283.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21531430522142 its reverse (24122503413512), we get a palindrome (45653933935654).

The spelling of 21531430522142 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty million, five hundred twenty-two thousand, one hundred forty-two".